Question

A game has 40 chips, each labeled with a number from 1 through 40. Ben randomly chooses one chip. What is the probability that he chooses 10 or a multiple of 8?

Answer 1

Total prob=Prob of choosing 10+Prob of choosing multiples of 8

Prob of choosing 10=1/40
Prob of choosing multiple of 8=5/40 multiples of 8 <40 (1*8 -- 5*8)